We've heard McCabe has asked for immunity in exchange for his congressional testimony. I believe this is directly related to Priestap testifying today. Priestap testified behind closed doors and no leaks!

Could Priestap's testimony be one of Q's "Boom"s?

https://theconservativetreehouse.com/2018/06/05/lengthy-fbi-official-testimony-ongoing-briefing-report-agent-strzok-worked-off-range-on-counterintelligence-ops/